Gold

Gold coatings are often used in infrared measurement technology and in low-power laser systems.

Gold coatings

Gold is the best material for all metallic coatings in the infrared range, but can only be used from a wavelength of 700 nanometers (nm). As a gold coating is soft, it scratches easily. For this reason, the gold coating should be provided with a dielectric coating.

Gold is a precious metal that does not tarnish and is therefore stable over the long term. A gold coating can therefore also be used without a protective layer, e.g. in FTIR spectroscopy. Areas of application for metallic coatings with gold are infrared mirrors (measurement technology), laser mirrors (low power applications) and protective coatings (corrosion protection).

Datasheet

Layer structure: Gold layer with oxidic protective layer.

Reflection, 632 ± 2 nm

R > 82,0 % ±2,5 % AOI 45° r-pol

Reflection, 1 – 2 µm

R > 95,0 % ±1,0 % AOI 45° r-pol

Reflection, > 2 µm

R > 98,0 % ±0,5 % AOI 45° r-pol

Reflection, 10,6 µm

R > 99,0 % ±0,2 % AOI 0°

R > 99,1 % ±0,2 % AOI 45° s-pol

R > 98,4 % ±0,2 % AOI 45° p-pol

Phase shift

Wavelength µm 10,6

Angle of incidence 45°

Phase shift < 2°

Coating properties

Adhesion MIL-C-48497 § 4.5.3.1

Humidity MIL-C-48497 § 4.5.3.2

Hardness MIL-C-48497 § 4.5.3.3

Temperature MIL-C-48497 § 4.5.4.1

Damage threshold

Wavelength 10,6 µm

Angle of incidence 45°

Damage threshold >286 kW/cm^(-2)

Wavelength 1064 nm

Angle of incidence 0°

Damage threshold 6,2 J/cm^(-2)

Applications

Optical measurement technology: thermography, FTIR, gas analysis
Laser mirror: low power laser markings
Laser measurement technology: 3D scanner
Protective coating: corrosion protection, e.g. for copper mirrors

Do you need more information about gold plating?

Please do not hesitate to contact us!

+49 2324 398-401

info@pleiger-laseroptik.de

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